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Influence of temperature on the characterization and localization of the different molecular forms of gonadotropin-releasing hormone during ontogeny of Steindachneridion parahybae (Siluriformes: Pimelodidae)

Grant number: 12/14115-1
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): November 01, 2012
Effective date (End): January 31, 2015
Field of knowledge:Biological Sciences - Physiology - General Physiology
Principal Investigator:Renata Guimarães Moreira Whitton
Grantee:Andreone Teles Medrado
Host Institution: Instituto de Biociências (IB). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated scholarship(s):13/25879-5 - Influence of temperature on characterization a localization of the different molecular forms of gonadotropin-releasing hormone during the ontogeny of Steindachneridion parahybae (Siluriformes: Pimelodidae), BE.EP.MS


Reproduction is one of the events, but the main, responsible for the maintenance of a species. However, organisms require certain environmental conditions and endogenous that modulating the reproduction. For aquatic organisms, for example, fish, temperature is one of the parameters that most affect life in the environment. As the temperature, other factors act as external stimuli that modulate fish reproduction, such as photoperiod, rainfall and electrical conductance of water, interacting with endogenous factors. The endogenous factors are in turn controlled by the endocrine system with the interaction of neurohormones. Among the neurohormones released during the reproductive process in teleosts, stand out the gonadotropin-releasing hormone (GnRH), which is present in several brain regions and hypothalamic fish. GnRH is a decapeptide and is present in teleost fish into two or three different molecular forms, which possibly have different roles in the synthesis and release of the pituitary gonadotropins. The synthesis of GnRH during embryonic development plays a crucial role in establishing the GnRH system, which later in adulthood, will be activated to give the initiation and maintenance of puberty and throughout adulthood. The emergence of different populations of GnRH differed among species of teleosts. Been observed that in Perciformes species with three different molecular forms of GnRH have their appearance at different times. As in Siluriformes species, which have only two different molecular forms of GnRH. In this sense, the objective of this project is to identify, characterize and monitor the migration of neurons of the different molecular forms of GnRH during ontogeny of Steindachneridion parahybae. (AU)

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